How to Change Mac System Language via Command Line

Polyglots, learners, and the bilingual often want to change their Mac system language for obvious reasons, but another less obvious situation can occur if you’re troubleshooting a Mac that either originates in another country, had the language changed at some point, or is just set to a different language.
Since it can be pretty challenging to navigate around in a language you don’t know at all or barely understand, it may be difficult to add and change the language in Mac OS X through System Preferences, and sometimes that easy approach is just downright impossible or inaccessible, perhaps because you’re reinstalling system software, or booted into Single User Mode for troubleshooting purposes.
But not to panic, you can also change the system language used on a Mac from the command line, handled entirely from the Terminal. This means you can either change the language directly from an active Terminal app, or even through ssh remotely if need be.
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